1074 SERPULA. 



Serpula intricata. Linnaus Si/st. Nat. p. 1265. Pennant 

 Zool. iv. p. 146. 

 Inhabits the shores of the Mediterranean, on Pinnae and the 



rubbish thrown up by the sea. LinncBus. Common on the 



coasts of Britain. 

 In the opinion of Da Costa and Montagu, this is not distinct 



from S. vermicularis, and it differs chiefly in being more 



grouped, and much more slender. 



CARINATA. 11. Shell regular, spiral, with the outer 

 whirl rising into a carinated ridge on the 

 top. 



Serpula carinata. Montagu Test. p. 502. Maton and 

 Racket, in Lin. Trans, viii. p. 242. 

 Inhabits the sea on other shells in Salcombe Bay, Devonshire. 



Mr. Montagu. 

 Shell about half the size of S. spirorbis, and a little spreading 



at the base ; besides the carinated ridge on the outer whirl, 



it also differs from S. spirorbis in having the middle whirl 



rather concave, and sometimes pervious. 



GRANULATA. 12. Shell taper, spiral, and glome- 

 rated, with three elevated ribs on the upper 

 side. 



Serpula granulata. Linnaus Syst.Nat. Tp. \16Q. Fabri- 

 cius Fauna Groenl. p. 380. Gmelin, p. 3741. Dono- 

 van, iii. t. 100. Montagu Test. p. 500. Maton and 

 Racket, in Lin. Trans, viii. p. 241. 

 Serpula sulcata. Adams in Lin. Trans, iii. p. 254. 

 Inhabits the Northern Ocean, on stones and shells ; and is not 



uncommon on the shores of Britain. 

 Shell opake, white, with two volutions, strongly ribbed longi- 

 tudinally and transversely wrinkled, especially in the furrows j 

 aperture round ; it is of the same size as S. spirorbis. 



CANCELLATA. 13. Shell spiral, glomerated, with 

 three grooves, the lower of which is inter- 

 rupted by transverse ribs; aperture biden- 

 tated. 



Serpula cancellata. Fabricius Fauna Groenl p. 383. Gme- 

 lin, p. 3746. 



Inhabits the shores of Greenland ; common with Serpula gra- 

 nulata. Fabricius. 



Shell white, greyish, or greenish, and nearly allied to S. granu- 



